package itheima.Controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import itheima.common.BaseContext;
import itheima.common.R;
import itheima.entity.ShoppingCart;
import itheima.service.ShoppingCarService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

/**
 * @author shkstart
 * @create 2022-09-23-10:15
 */
@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {


    @Autowired
    private ShoppingCarService shoppingCarService;

    /**
     * 添加购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据:{}",shoppingCart);

        //设置用户id，指定当前是哪个用户的购物车数据
        //BaseContext:自定义的工具类，用来保存和获取用户id
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        //查询当前菜品或者套餐是否在购物车中
        //获取菜品id
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(ShoppingCart::getUserId,currentId);

        if (dishId != null){
            //添加到购物车的是菜品
            lambdaQueryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else{
            //添加到购物车的是套餐
            lambdaQueryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());

        }

        //SQL:select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
        ShoppingCart serviceOne = shoppingCarService.getOne(lambdaQueryWrapper);
        if (serviceOne != null){
            //如果已经存在，就在原来数量基础上加一
            Integer number = serviceOne.getNumber();
            serviceOne.setNumber(number+1);
            shoppingCarService.updateById(serviceOne);
        }else{
            //如果不存在，则添加到购物车，数量默认就是一
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCarService.save(shoppingCart);
            //统一返回值
            serviceOne = shoppingCart;
        }


        return R.success(serviceOne);
    }

    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车。。");

        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        //更新时间来降序排序
        //orderByAsc:降序排序
        lambdaQueryWrapper.orderByAsc(ShoppingCart::getCreateTime);

        List<ShoppingCart> list = shoppingCarService.list(lambdaQueryWrapper);

        return R.success(list);
    }

    @DeleteMapping("/clean")
    public R<String> clean(){
        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        shoppingCarService.remove(lambdaQueryWrapper);
        return R.success("删除成功");
    }

    @PostMapping("/sub")
    public R<String> sub(){

        return null;
    }
}
